Simultaneous biosorption of nickel and cadmium by the brown algae Cystoseria indica characterized by isotherm and kinetic models

Applied Biological Chemistry

Table 2 Optimum isotherm parameters of binary-metal-component systems for adsorption of nickel and cadmium using Cystoseria indica treated with NaCl (pH = 6, contact time 4 h, temperature 25 °C, impeller speed 175 rpm)

Isotherms	Parameters	Nickel	Cadmium
Extended-Langmuir	q_m (mg/g)	18.170	55.341
	K_L (L/mg)	0.166	0.203
	R²	0.920	0.90
Extended-Freundlich	x	0.004	0.028
	y	1.090	2.880
	z	0.010	0.190
	R²	0.940	0.970